Chater 47 & 51 Flashcards

1
Q

How long should you wait before you separate a model from the impression?

A

45-60 mins

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2
Q

When pouring an impression where do you begin placing the gypsum material in a mandibular impression?

A

Posterior tooth to the right

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3
Q

List the 2 parts of the dental model?

A

Art and Anatomic

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4
Q

How are gypsum material mixed?

A

Bowl and spatula

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5
Q

When mixing gypsum materials, how are the powder and water incorporated?

A

Powder to water

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6
Q

How many types of gypsum products do we have in dentistry? Name them.

A
  1. Dental plaster
  2. Dental Stone
  3. High strength stone
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7
Q

What is another name for dental model?

A

Study cast

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8
Q

What type of wax is used to form a wall around a preliminary impression when pouring it up?

A

Boxing wax

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9
Q

Acrylic resin for the fabrication of trays is supplied as:

A

Liquid + powder

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10
Q

What type of custom tray is made for a vital bleaching procedure?

A

Thermo plastic resin

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11
Q

Of the three types of custom trays discussed which technique use a volatile hazardous material?

A

Acrylic resin tray

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12
Q

What specialty practises might have a more expensive laboratory?

A

Ortho, prosthodontist, paediatrics

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13
Q

Which would be an example of a contaminated item commonly found in the dental laboratory?

A

Impression

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14
Q

What piece of equipment is used to grind away plaster or stone?

A

Dental model trimmer

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15
Q

The size of a wax spatula most commonly used in the lab is a #____

A

7

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16
Q

What piece of equipment does the dentist use to determine centric relation from a diagnostic model?

A

Articulator

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17
Q

Which of the two models do you begin trimming first?

A

Maxillary

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18
Q

What is the one specific area on a dental model where the maxillary and mandibular model is trimmed differently?

A

Anterior portion

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19
Q

What should be placed between the two models when trimming them together?

A

Wax bite

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20
Q

This material is a mixture of gypsum and water used in the finishing of models when voids are present:

21
Q

To extend an impression tray what wax is used?

A

Utility wax

22
Q

What type of wax is used to get a patient’s bite?

A

Baseplate wax

23
Q

What is placed to prevent a tray from sitting too deeply onto the arch or quadrant?

A

Utility wax

24
Q

How are dental impressions cared for before they are taken to the dental lab?

A

Disinfected, washed off and labelled

25
With Alginate impressions how long should you wait before pouring the impression?
Only 1 hour because it will dry out
26
Four examples where dental models can be useful for dental procedures?
1. visual presentation of dental treatment 2. fixed or moveable prosthetic device 3. Orthodontics appliances 4. production of custom trays
27
What is the main purpose of the vibrator?
To get rid of air bubbles
28
How fast can your laboratory handpiece go?
20,000 RPM
29
Your vacuum form can be used to do what type of dental product?
Bleaching tray and custom fluoride tray
30
When would the use of the sandblaster be needed in the dental lab?
Crown and dentures
31
How many methods of pouring do we have in dentistry? Name them
1. invert a poor 2. double pour 3. Box pour
32
What is double pour?
Anatomic first, set new mix then art portion
33
What is Inverted poor?
One mixture both anatomic + art
34
What is a Box poor?
Make a small box and pour up
35
What are five laboratory rules?
``` 1- no eating or drinking 2- wear all PPES 3- hair up 4-report all incidences 5- stays clean ```
36
What type of procedures will be performed in a dental laboratory?
Making a dental model, trim and finish and custom tray
37
What does the anatomical portion of the dental model consist of?
Teeth, oral mucosa, muscle attachment
38
What should you do to your model before you start trimming?
Wet or soak
39
When turning on your model trimmer what do you need to make sure you do before you start trimming?
Turn on water
40
Which material is used to construct a custom tray?
Acrylic resin, thermaoplastic, light cured
41
What do you do to prevent walking on a provisional restoration?
Vaseline
42
What are the powder/water ratio of the 3 gypsum products?
Plaster – 100 g to 45-50 water Regular stone – 100 g to 30-32 water High stone – 100 g to 19-24 water
43
Which type of chips and is commonly referred to as plaster of Paris?
Model plaster
44
What type of inly wax is used for indirect wax patterns on dies?
Type B
45
Which type of wax is used to cover orthodontic brackets?
Utility wax
46
Another name for a dental model is?
Dental cast
47
What dental material is used in the creation of a dental model?
Gypsum
48
How was self-cured acrylic resin supplied for the fabrication of custom trays?
Powder and liquid
49
What technique is used as a volatile hazardous material?
Acrylic resin